阅读说明：本技术 直线电动机的电枢芯 (Armature core of linear motor ) 是由 西福元彰 于 2020-10-27 设计创作，主要内容包括：本发明涉及一种直线电动机的电枢芯。抑制液体向电枢芯的内部浸入。直线电动机的电枢芯包括：芯主体,其具有供绕组卷绕的多个齿部,该芯主体由层叠钢板构成；块,其配置于芯主体的内部；紧固用孔,其设于块,供紧固件插入；以及紧固件贯通构件,其具有紧固件贯通孔,该紧固件贯通构件能够以芯主体的外部和紧固用孔的内部经由紧固件贯通孔连通的状态配置于芯主体,贯通于紧固件贯通孔的紧固件借助紧固用孔紧固于块,从而芯主体借助块固定于固定对象物,电枢芯具有密封构造,该密封构造在紧固件贯通构件包围紧固用孔的开口部的状态下阻挡液体从开口部向紧固件贯通构件的外部通过。(The present invention relates to an armature core of a linear motor. The liquid is inhibited from entering the interior of the armature core. An armature core of a linear motor includes: a core main body having a plurality of teeth portions around which a winding is wound, the core main body being formed of laminated steel sheets; a block disposed inside the core main body; a fastening hole, which is provided in the block and into which a fastener is inserted; and a fastener penetration member having a fastener penetration hole, the fastener penetration member being disposed on the core main body in a state where an outside of the core main body and an inside of the fastening hole communicate with each other through the fastener penetration hole, the fastener penetrating the fastener penetration hole being fastened to the block through the fastening hole, the core main body being fixed to the object to be fixed through the block, the armature core having a seal structure that blocks passage of liquid from the opening portion to the outside of the fastener penetration member in a state where the fastener penetration member surrounds the opening portion of the fastening hole.)

1. An armature core of a linear motor, the armature core comprising:

a core main body having a plurality of teeth portions around which a winding is wound, the core main body being formed of laminated steel sheets;

a block disposed inside the core main body;

a fastening hole provided in the block and into which a fastening member is inserted; and

a fastener penetration member having a fastener penetration hole, the fastener penetration member being configured to the core main body in a state where an outside of the core main body and an inside of the fastening hole communicate with each other through the fastener penetration hole,

the fastener penetrating the fastener through hole is fastened to the block through the fastening hole, and the core main body is fixed to an object to be fixed through the block,

the armature core has a seal structure that blocks passage of liquid from the opening portion to the outside of the fastener penetration member in a state where the fastener penetration member surrounds the opening portion of the fastening hole.

2. The armature core of a linear motor according to claim 1,

the seal structure has a groove provided in the block and a fitting portion provided in the fastener penetration member and fitted in the groove.

3. The armature core of a linear motor according to claim 1,

the seal structure has a seal member provided between the block and the fastener penetration member.

4. The armature core of a linear motor according to any one of claims 1 to 3,

the fastener penetration member has a flange portion extending from an end portion of the fastener penetration member on a side opposite to the block in a direction substantially orthogonal to an axial direction of the fastener penetration hole.

5. The armature core of a linear motor according to any one of claims 1 to 4,

the fastening member is an externally threaded member having an externally threaded portion, and the fastening hole is an internally threaded hole into which the externally threaded portion is threadedly engaged.

Technical Field

The present invention relates to an armature core.

Background

Conventionally, as a core of an armature used in various motors, generators, and the like, there is a core mainly composed of a laminated steel plate (laminated core) in which a plurality of steel plates such as silicon steel plates are laminated. In an armature including such an armature core, there is known a structure as follows (for example, see patent document 1): a screw hole is provided in a laminated iron core constituting an armature for a linear motor, and a bolt passed through a mounting plate is screwed into the screw hole to fix the laminated iron core to the mounting plate.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2011-101551

Disclosure of Invention

Problems to be solved by the invention

However, such an armature core is sometimes used in an environment where it comes into contact with a liquid such as a cutting fluid when used in a machine tool or the like, and if such a liquid enters the inside of the armature core (between steel plates or the like), the performance of the armature is affected, resulting in a failure. Therefore, a structure that suppresses the intrusion of liquid into the interior of the armature core is desired.

Means for solving the problems

An armature core according to an aspect of the present disclosure includes: a core main body having a plurality of teeth portions around which a winding is wound, the core main body being formed of laminated steel sheets; a block disposed inside the core main body; a fastening hole provided in the block and into which a fastening member is inserted; and a fastener penetration member that has a fastener penetration hole and is disposed on the core main body in a state in which an outside of the core main body and an inside of the fastening hole communicate with each other through the fastener penetration hole, wherein the fastener penetrating the fastener penetration hole is fastened to the block through the fastening hole, and the core main body is fixed to an object to be fixed through the block, and the armature core has a seal structure that blocks passage of a liquid from an opening portion of the fastening hole to an outside of the fastener penetration member in a state in which the fastener penetration member surrounds the opening portion.

ADVANTAGEOUS EFFECTS OF INVENTION

According to one aspect, the intrusion of the liquid into the interior of the armature core can be suppressed.

Drawings

Fig. 1 is a perspective view of an armature core according to embodiment 1 of the present disclosure.

Fig. 2 is a vertical cross-sectional view showing a state in which the armature core of embodiment 1 is covered with a cover.

Fig. 3 is a longitudinal sectional view showing the seal structure of embodiment 1.

Fig. 4 is a vertical cross-sectional view showing a state in which the armature core according to embodiment 1 is fixed to the mounting plate.

Fig. 5 is a longitudinal sectional view showing a seal structure according to embodiment 2 of the present disclosure.

Fig. 6 is a vertical cross-sectional view of embodiment 3 of the present disclosure showing a flange portion provided on the screw penetration member of embodiment 2, and shows a state in which the screw penetration member is attached to the core body in the middle.

Fig. 7 is a vertical cross-sectional view showing a state in which the screw penetration member according to embodiment 3 is attached to the core main body.

Description of the reference numerals

1. An armature core; 3. a winding; 10. a core body; 12. a tooth portion; 20. a block; 25. an internal threaded hole (fastening hole); 25a, an opening; 30. a screw passing member (fastener passing member); 31. screw through-holes (fastener through-holes); 35. a flange portion; 40. a sealing structure; 41. a groove part; 42. a fitting portion; 45. a sealing member; 50. a mounting plate (object to be fixed); 60. an externally threaded member (fastener); 61. an external threaded portion.

Detailed Description

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

(embodiment 1)

Fig. 1 shows an armature core 1 for a linear motor according to embodiment 1. As shown in fig. 2, the armature core 1 is used in a state where the entire surface is covered with a cover 2 formed of a thin metal plate such as stainless steel. The cover 2 is provided to the armature core 1 to prevent a liquid such as a cutting fluid from contacting the armature core 1. The cover 2 has a hole 2a for exposing the screw through hole 31 to the outside at a position corresponding to the screw through hole 31 described later.

As shown in fig. 1 and 2, the armature core 1 includes a core main body 10, a plurality of blocks 20 arranged inside the core main body 10, a female screw hole 25 provided in the block 20, and a screw penetration member 30 provided in the core main body 10. In addition, as shown in fig. 3, the armature core 1 includes a seal structure 40.

The core main body 10 has a plate portion 11 of a rectangular shape and a plurality of tooth portions 12 protruding from one surface of the plate portion 11 and parallel to each other. The plurality of teeth 12 project in the Z direction shown in fig. 1, extend in the X direction and the Z direction (along the X-Z plane), and are arranged in the Y direction. The core body 10 has slots 13 between the plurality of teeth 12. As shown in fig. 2, the winding 3 disposed across the adjacent slots 13 is wound around the tooth portions 12. The directions of coordinate axes X, Y, Z shown in fig. 2 and later correspond to fig. 1.

As shown in fig. 1, the core body 10 is formed of a laminated steel sheet in which a plurality of steel sheets 14 having a comb shape are laminated in the X direction of fig. 1. As the steel plate 14, a thin plate made of an electromagnetic steel plate such as a silicon steel plate is used. The steel plates 14 have a predetermined magnetic pole shape, and are stacked in an aligned shape to constitute the core main body 10.

The block 20 is formed of metal in a rectangular parallelepiped shape. The block 20 is embedded in the root of the plurality of tooth portions 12 at a suitably separated position among the plurality of tooth portions 12 in the core main body 10. One reason why the block 20 is embedded in the root of the tooth portion 12 is to suppress the size of the core body 10 (particularly, the size in the Z direction). As shown in fig. 2, in the present embodiment, one block 20 is used at each end portion in the longitudinal direction (Y direction in fig. 1) of the core main body 10, 2 blocks 20 are used at the central portion, and 4 blocks 20 are used in total. The block 20 is disposed in the through hole 15, and the through hole 15 is provided in the core body 10 and penetrates in the lamination direction (X direction) of the steel plates 14. The block 20 is fixed to the core main body 10 by means of adhesion or the like. The number of blocks 20 is not limited to 4, and may be set arbitrarily according to design requirements and the like.

As shown in fig. 3, the axial direction of the female screw hole 25 extends in the Z direction. The female screw hole 25 constitutes an example of a fastening hole of the present disclosure. The female screw hole 25 is provided in the block 20 in a state of being opened in the surface 21 of the block 20 on the plate portion 11 side. The female screw hole 25 has an opening 25a that opens to the surface 21. The male screw portion 61 of the male screw member 60 described later is screwed and fastened to the female screw hole 25 through the opening 25 a. In the present embodiment, two female screw holes 25 are provided at a predetermined interval in the longitudinal direction (X direction in fig. 1) of the block 20. The number of the female screw holes 25 is not limited, and may be set arbitrarily according to design requirements and the like.

As shown in fig. 3, the screw penetration member 30 is a cylindrical member whose axial direction extends in the Z direction. The screw penetration member 30 has a screw penetration hole 31 therein. The screw penetration member 30 constitutes an example of the fastener penetration member of the present disclosure. The screw through hole 31 constitutes an example of a fastener through hole of the present disclosure. The screw penetration member 30 is fitted into the fitting hole 10a provided in the core body 10 corresponding to each internal thread hole 25 substantially concentrically with the internal thread hole 25. The fitting hole 10a communicates between the outside of the plate portion 11 of the core body 10 on the surface 11a side and the inside of the female screw hole 25. In the cylindrical screw penetration member 30, the outer diameter is slightly smaller than the width dimension (length in the Y direction in fig. 3) of the block 20, and the inner diameter (inner diameter of the screw penetration hole 31) is larger than the inner diameter of the female screw hole 25. The screw penetration member 30 surrounds the opening 25a of the female screw hole 25.

As shown in fig. 3, the seal structure 40 includes a groove 41 provided in the block 20, and a fitting portion 42 provided in the screw penetration member 30 and fitted into the groove 41. The groove 41 is a cylindrical slit (annular bottomed groove) and is provided on the surface 21 of the block 20. The fitting portion 42 is formed by one end portion of the screw penetration member 30 on the side opposite to the block 20. The fitting portion 42 is press-fitted into the groove portion 41, for example, so as to be closely fitted to the inner circumferential surface and the outer circumferential surface of the groove portion 41. The seal structure 40 blocks the passage of liquid from the opening 25a to the outer peripheral portion side of the screw penetration member 30 in a state where the screw penetration member 30 surrounds the opening 25a of the female screw hole 25. In addition, if the liquid is designed to be blocked from passing, it does not matter even if the liquid inevitably passes in some cases.

The screw penetration member 30 is molded from metal, resin, or the like. When the screw penetration member 30 is made of resin, the screw penetration member 30 can be manufactured by injection molding. Further, the screw penetration member 30 may be integrally molded with the core body 10 by insert molding a resin into the fitting hole 10 a. In the case of insert molding, the core body 10 to which the block 20 is attached is placed in a molding die, and resin is injected into the fitting hole 10a and the groove portion 41, whereby the screw penetration member 30 and the seal structure 40 are molded together with the fitting portion 42 in the groove portion 41. When the screw passing-through member 30 is molded by insert molding, a plurality of screw passing-through members 30 can be provided at the same time in the core body 10, and therefore, there is an advantage that productivity is improved.

For example, as shown in fig. 4, the armature core 1 is fixed to a mounting plate 50 by an external screw member 60 such as a bolt, and the mounting plate 50 is provided so as to be movable along a feed shaft (not shown) of a machine tool or the like. The attachment plate 50 constitutes an example of the object to be fixed of the present disclosure. The male screw portion 61 of the male screw member 60 inserted through the mounting hole 50a of the mounting plate 50 is screwed and fastened to the female screw hole 25 from the opening 25a of the female screw hole 25 of the block 20 through the screw through hole 31, and the armature core 1 is fixed to the mounting plate 50 via the block 20. The armature core 1 is combined with a field pole (not shown) disposed on the tooth 12 side to constitute a linear motor. The linear motor linearly drives the armature core 1 in the Y direction of fig. 1.

The armature core 1 of embodiment 1 of the present disclosure includes: a core main body 10 having a plurality of teeth 12 around which the coil 3 is wound, the core main body 10 being formed of laminated steel sheets; a block 20 disposed inside the core main body 10; an internally threaded hole 25 provided in the block 20; and a screw passing-through member 30 having a screw through hole 31, the screw passing-through member 30 being capable of being disposed on the core body 10 in a state where the outside of the core body 10 and the inside of the female screw hole 25 communicate with each other via the screw through hole 31, and the core body 10 being fixed to the attachment plate 50 via the block 20 by screwing and fastening the male screw portion 61 of the male screw member 60 to the female screw hole 25 via the screw through hole 31. The armature core 1 has a seal structure 40 that blocks the passage of liquid from the opening 25a to the outer peripheral portion side of the screw penetration member 30 in a state where the screw penetration member 30 surrounds the opening 25a of the female screw hole 25.

In the armature core 1 of embodiment 1, for example, in a case where the armature core 1 is in contact with a liquid such as oil or cutting fluid used in a machine tool, the entry of such a liquid (hereinafter, simply referred to as "liquid") into the armature core 1 is substantially prevented by the cover 2. However, in addition to this, there is liquid entering the inside of the cover 2 from the hole 2a of the cover 2. The liquid that has entered the inside of the cap 2 from the hole 2a of the cap 2 enters the screw through hole 31 and reaches the periphery of the opening 25a of the block 20 (the periphery of the male screw portion 61). The seal structure 40 blocks the liquid from passing to the outer peripheral portion side of the screw penetration member 30. That is, the fitting portion 42 of the screw penetration member 30 is fitted with the groove portion 41, thereby blocking the passage of liquid from the inside of the screw penetration member 30 to the outer peripheral portion side.

Therefore, the liquid stays around the opening 25a of the block 20 inside the screw penetration member 30 or enters the female screw hole 25, thereby suppressing the liquid from entering the inside of the core main body 10 (between the steel plates 14, etc.). As a result, the occurrence of problems such as a decrease in performance and a failure of the linear motor due to the liquid entering the armature core 1 is suppressed.

Next, embodiments 2 and 3 of the present disclosure will be described with reference to the description of embodiment 1. In the following description, the same components as those in embodiment 1 are denoted by the same reference numerals, and description thereof will be omitted or simplified, and differences will be mainly described.

(embodiment 2)

Fig. 5 shows a seal structure 40 according to embodiment 2. The seal structure 40 of embodiment 2 has a seal member 45 provided between the block 20 and the screw penetration member 30. The sealing member 45 is an annular member formed of an elastic member such as rubber, and is fitted into the circumferential groove 22 provided on the surface 21 of the block 20. The annular end surface of the screw penetration member 30 facing the block 20 is pressed against the seal member 45 in a state where a certain level of pressure is applied to the seal member 45. Thereby, the sealing member 45 is fitted in the peripheral groove 22 in a slightly compressed state.

According to embodiment 2, the passage of liquid from the inside of the screw penetrating member 30 to the outer peripheral portion side is blocked by the seal member 45. As a result, as in embodiment 1, the intrusion of liquid into the interior of the core body 10 (between the steel plates 14, etc.) is suppressed, and as a result, the occurrence of problems such as a decrease in the performance of the linear motor and a failure due to the intrusion of liquid into the armature core 1 is suppressed.

(embodiment 3)

Fig. 6 and 7 show a 3 rd embodiment in which a flange 35 is added to the screw penetration member 30 of the 2 nd embodiment.

The flange portion 35 is provided at an end portion on the outer side of the screw penetration member 30, that is, at an end portion on the opposite side to the block 20. Fig. 6 shows a state in which the flange portion 35 is being fitted into the fitting hole 10a of the core main body 10. As shown in fig. 6, the flange portion 35 is formed by bending in a natural state so as to be inclined inward (downward in fig. 6) in the axial direction of the screw through hole 31. Then, as shown in fig. 7, when the screw penetration member 30 is fitted into the fitting hole 10a in a state of being pressed against the sealing member 45, the flange portion 35 is elastically deformed to be elastically brought into close contact with the surface 11a of the plate portion 11 of the core main body 10. In this state, the flange portion 35 extends in a direction substantially orthogonal to the axial direction (Z direction in fig. 7) of the screw through hole 31. When the armature core 1 is fixed to the attachment plate 50 as shown in fig. 4, the screw penetration member 30 can be fitted into the fitting hole 10a by pressing the armature core through the attachment plate 50.

According to embodiment 3, the flange portion 35 prevents liquid from entering the fitting hole 10a into which the screw penetration member 30 is fitted. Therefore, the liquid can be further suppressed from entering the core main body 10 (between the steel plates 14, etc.).

The seal structure of the present disclosure is not limited to the seal structure 40 of the above-described embodiments 1 to 3, and may be any structure as long as it blocks the passage of liquid from the opening 25a to the outer peripheral portion side of the screw penetration member 30 in a state where the screw penetration member 30 surrounds the opening 25a of the female screw hole 25.

In each of the above embodiments, the male screw member 60 is fastened to the block 20, and the core main body 10 is fixed to the attachment plate 50 via the block 20, but the fastener of the present disclosure fastened to the block 20 is not limited to the male screw member 60. The fastener of the present disclosure may be any type as long as it is fastened to the block 20 and fixes the core main body 10 to the mounting plate 50 via the block 20.